Automatic lathe attachment.



No. 649,904. Patented May 22, I900. J. P, BROPHY.

AUTOMATIC LATHE-ATTACHMENT.

(Application filed July 17, 1899.) (No Model.) 3 Sheets-Sheet l.

Wa'inessex, I/zvemor (No Model.)

W? in asses,

Patented May 22, i900. J. P. BRUPHY.

AUTOMATIC LATHE ATTACHMENT.

(Application filed July 17, 1899.)

3 Sheets-Sheet 2 In I) en/tar;

THE uonms PiTERS co, Wm-o-umo v wAsumm'oN, n c,

Patented May 22, I900. J. P. BROPHY.

AUTOMATIC LATHE ATTACHMENT.

(Applicutiun filed July 17, 1899.)

(No Model.)

3 Sheets-Shaet 3,

In vezmfor,

w: Norms pan: cu PNOYU-l WHO 'wAsHmmom n c Un'rtnn Srarns JOHN P.BROPIIY, OF CLEVELAND, OHIO, ASSIGNOR TO THE CLEVELAND MACHINE SCREWCOMPANY, OF SAME PLACE.

AUTOMATIC LATHE ATTACHMENT.

SPECIFICATION forming part of Letters Patent N 0. 649,904, dated May 22,1900.

' Application filed July 17, 1899. Serial No. 724,091. (No model.)

To all whom it may concern:

Be it known that I, JOHN P. BROPHY, a citizen of the United States, anda resident of Cleveland, county of Cuyahoga, and State of Ohio, haveinvented a new and useful Improvement in Automatic Lathe Attachments, ofwhich the following is a specification, the principle of the inventionbeing herein explained and the best mode in which I have contemplatedapplying that principle soas to distinguish it from other inventions.

My invention relates to attachments for a utomatic lathes for performinga special operation upon the Work in connection with other operations tobe performed by the tools in the turret, and particularly to thatoperation called side drilling, in which a cylindrical or other blank isrequired to be drilled in a direction transverse to its axis ofrotation, said invention consisting of means hereinafter fullydescribed.

The annexed drawings and the following description set forth in detailcertain mechanism embodying the invention, such disclosed meansconstituting but one of various mechanical forms in which the principleof the invention may be used.

In said annexed drawings, Figure I represents an end View of thehead-stock of an automatic lathe, showing an end elevation of across-slide and my improved drilling device as applied thereto. Fig. IIrepresents a top plan of same, showing only the end of the head-stockwith a blank secured therein; and Fig. III represents a vertical sectiontaken upon line 3 23, Fig. II.

Upon a cross-slide A is secured a housing 13, in the upper part of whichis formed a bearing 1), Fig. I, in which is mounted a spindle C, on oneend of which is provided a suitable chuck for securing a drill and uponthe opposite end of which is secured a sheave, as shown in Fig. II.Through a bearing 1), formed upon the housing, Figs. II and III,extendsa longitudinally-movable rod D, upon the end of which is formedor secured a segmental brake member or shoe (1 of trapezoidalcross-section, whose friction surface is made of leather, rubber, orother suitable material. A pin or key d extends through said rod D andis secured to the top of a barrel E, in which is located a spring E,said barrel sliding freely in a bore E formed in the housing, as shownin Fig. III. One end of said spring abuts the end of said barrel andextends through the opposite end thereof, abutting the closed end ofsaid bore, as shown. The direction of travelof the rod and barrel is atright angles to the axis of the head-stock G of the lathe, and thespring actuates the brake-shoe d toward said axis, the key d limitingthe movement in the direction by engaging the housing, in which isformed part of the bearing for rod 1), as may be understood from Fig.III. In the line of travel of the brake-shoe d and secured to or formedupon the rotating headstock G is a second brake member g, consisting ofa wheel provided with a groove having a trapezoidal cross-sectionsimilar to, but of less area, than that of said brake-shoe.

The device operates as follows: The drill chuck and drill are rapidlyrotated by a belt running upon the sheave, and suitable mechanism isprovided for reciprocating the crossslide, the advance and return beingimparted at the proper time. The length of the stroke of the slide ismade such that the brake members will not be in engagement at the end ofthe return stroke, as shown in dotted lines, Fig. Ill. The blank articleto be cross-drilled being rapidly rotated for the operation of othertools which are required to perform their respective functions and thehead-stockdriving means having been automatically disconnected thecross-slide is advanced toward the blank for the purpose ofcross-drilling. Before the drill reaches its point of entrance, however,the two brake members come into operative engagement, Fig. I, and on thecontinued advance effect the discontinuance of the rotation of thehead-stock. After such discontinuance the slide continues to advance,causing the brake shoes to yield, respectively, to the cross-slide, andthe rod D to be pushed back against the action of the spring E, thebarrel E entering the bore E and during the time that the drill isentering the blank, as shown in Fig. II, the latter is held firmly andcontinuously againstrotation, thus permitting the drilling operation tobe perfectly performed. On the return stroke of the slide the drill isWithdrawn and after such withdrawal and the continued retraction thebrake members are disen gaged,permittin g the head-stock-rotating meansto be again thrown into gear and any further desired operation permittedWithout any frictional resistance on behalf of the brake mechanism.

Other modes of applying the principle of myinvention may be employedinstead of the one explained, change being made as regards the mechanismherein disclosed, provided the means covered by any one of the followingclaims be employed. 7

I therefore particularly point out and distinctly claim as myinvention 1. In an automatic lathe, the combination of meansfor rotatinga blank, a tool for operating upon such blank, means for advancing saidtool toward the latter, said rotating and advancing means each providedwith a brake member, such members adapted to cooperate to brake therotation'of said blank on the advance of the tool, substantially as setforth.

2. In an automatic lathe, the combination of means for holding androtating a blank, a drill mounted upon a cross-slide, means forreciprocating said cross slide whereby said drill may be caused to enterthe blank in a direction transverse to the axis of rotation of thelatter and a brake member mounted upon said slide and cooperating with abrake member connected with the blank-holding means to brake therotation of the blank on the advance of the slide toward the latter,substantially as set forth.

3. In an automatic lathe, the combination of a rotatable blank-holder, adrill mounted vupon a cross-slide, means for reciprocating said slide, abrake member secured to said blank-holder, and a yielding brake membermounted upon said slide and adapted to cooperate with said first-namedbrake member, substantially as set forth.

4. In an automatic lathe, the combination of a rotatable blank-holder, adrill mounted upon a cross-slide, means for advancing said slide towardsaid holder, a brake member to tatable with the latter, and aspring-actuated brake member mounted upon said cross-slide and adaptedto engage said first-named brake member on the advance of said slide,substantially as set forth.

Signed by me this 5th day of July, 1899.

J. P. BROPHY.

Attest:

D. T. DAVIES, A. E. MERKEL.

